package com.itheima.service;

import com.itheima.pojo.Member;

import java.util.List;

/**
 * 会员服务类接口
 */
public interface MemberService {
    //根据电话号码查询是否为会员
    Member findByTelephone(String telephone);
    //新增成为会员
    void add(Member member);
    //折线图
    List<Integer> findMemberCountByMonths(List<String> months);
}
